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[QUOTE="Nyikadzino, post: 17143"]
The reference level for sound measurements depends on the sound and its context. Take, for example, [URL='https://goldmidi.com/community/resources/spl-sound-pressure-level-expagorated.619/']dB SPL[/URL], which is used to measure sounds in the air, such as the volume of a person's voice or the loudness of the music concerts. This reference level is based on the threshold of human hearing and is typically set at 0 dB SPL at 1,000 Hz.

On the other hand, there's [URL='https://goldmidi.com/community/resources/what-is-the-difference-between-dbfs-and-dbtp.70/']dBFS[/URL], which is used to measure digital audio signals. This reference level is based on the maximum level that a digital audio signal can have without distortion, and it's usually set at 0 dBFS. And then there is +4 dBu and -10 decibel Volt, which are used to measure analog audio signals.

These reference levels are based on commonly used levels in professional and consumer audio equipment, respectively, and are typically referenced to voltage levels of 0.775 V and 1 V, respectively. So, the reference level used for a given measurement depends on the sound, the equipment, and the context.
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